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Carbon-fiber-reinforced plastic (CFRP) can be difficult to recycle owing to the presence of thermosetting plastics such as epoxy resin. Therefore, it is important to develop more efficient methods for recycling CFRP. Herein, we investigated the chemical recycling of CFRP containing an epoxy matrix resin via a process involving superheated and supercritical acetone. The decomposition efficiency of the epoxy resin in the CFRP at 2–14?MPa and 350?°C increased with increasing reaction time over the first 60?min, but then decreased over longer reaction times because the decomposition products carbonized. Furthermore, the decomposition efficiency increased with increasing reaction pressure and acetone density, to a maximum of 95.6% at 350?°C, 60?min, and a density of 4.35?mol/L (14?MPa). The decomposition rate of the epoxy resin in CFRP using superheated and supercritical acetone is rationalized by a surface-reaction and shrinking-core model, with large negative activation volumes.

» Author: Idzumi Okajima, Takeshi Sako

» Reference: 10.1016/j.polymdegradstab.2019.02.018

» Publication Date: 21/02/2019

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